4-144
. D control : This control has the opposite effect when compared to the result of
integral control. The input deviation is differentially controlled in order to
increase the system response. Note that this function might easily cause
the system is unstable, so it requires careful adjustment.
. PID control: Combining the best of P, I and D control features enables the system
control optimization.
Refer to Figure 4.3.77 for PID control operation
Control
Deviation
t
PID Control
t
I Control
P Control
D
Figure 4.3.77 PID control operation
PID control type
The inverter contains two types of PID control:
(a) PID control for the feedback value differential: (when 10-03 = x1xxb)
For PID control for the feedback value differential, the feedback value is
differential. Different response can be achieved by changing the target value and
control procedure. Be more careful to adjust the PID parameters so as to maintain
system stable. Refer to Figure 4.3.78 for PID control for feedback value
differential.
Figure 4.3.78 PID control for feedback differential value
(b) Basic PID control: (when 10-03 = x0xxb)
This is the basic type of PID control. Refer to the figure 4.3.79 for basic PID control.
Target value
Feedback value
Controlled
procedure
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